COPEPODA 125 



The abdomen, which is -^ as long as the anterior division, has the furcal rami about as long 

 as the fourth somite, and about as long as wide. The genital somite, which is as deep as wide, is 

 somewhat wider than long; in dorsal view it is distinctly asymmetrical and more convex on the left 

 than on the right side; on the left side, near the hinder margin, we observe a lamellous process with 

 broad base, and directed backwards and somewhat outwards; behind this, as seen in fig. 4a, another 

 less prominent elevation was observed. The genital area is well produced in front, and the median 

 prominent crista, which is prominent in Giesbrecht's fig. 21 (Taf. 36) oi E. venusta, was not seen. 

 The triangular teeth along the hinder margin of abdominal somites 10^2, 3 and 4 are only poorly 

 developed. 



The antennulae reach the end of the body, their appendages are scarcely different from those 

 of E. messhiciisis, and the measurements are very much alike. The endopodite of the antennae is about 

 half as long as the exopodite, and its second segment has 9 setae in Li and 9 in Le. The Re I, which 

 has a well developed conical process without any seta, is fairly well separated from Re 2 (PI. VIII 

 fig. 3). The Diaxillulae differ from those of Euc. viessinensis by the presence of a less powerfuU Sa in 

 Ri I. The viaxillac have the outer margin rather suddenly produced as in E. rostrafa, but are in other 

 respects scarcely different from E. viessinensis^ the maxillipeds differ from those of the latter species 

 by the almost straight exterior margin of the third basipodite. The glandular pore in the outer margin 

 of Re III of pes I is more removed from base, in other respects the first pair of legs is like E. vies- 

 sinensis. The Se of Ri I of pes II is more prominent than in E. viessine?isis (cf. text-fig. 31a); the ac- 

 cessory tooth of the Se Ri I is indistinct in pes III, and completely wanting in pes IV. As in E. cur- 

 ticauda no glandular pore was found in Re I of pes III — IV. The second basipodite of the fourth pair 

 of legs has only a single strong spine, extending to end of segment (text-fig. 32 a). 



The labnivi is in lateral view like that of Euc. iiiessineiisis; its oral surface (fig. 4 b) is in 

 structure lying between that of E. ii/cssinoisis and curticauda (fig. 2 a and 3 c). The first group consist of 

 an area with densely placed, fairly strong spines; the second group is represented by 2—3 longitudinal 

 rows of short teeth, laterally to which a similar longitudinal row is seen ; the third group consists of 

 about 5 fairly long spines, placed medially to and partly in front of the posterior part of second group. 

 Behind the median spot Nr. 4 a square area of small spinules and a posterior transverse row are found. 

 The laviina labialis (cf; fig. 5 f) is like that of E. viaxivia Wolf., but is more distinctly granular posteriorly. 

 The area in front of lamina labialis is like that of E. viessinensis, and so is the area behind, which, 

 however, in the posterior groups shows some not quite unimportant differences. 



f c?. Size of male from Thor St. 88 5-3 mm.; anterior division 4-2 mm; urosome i-i mm. 



The body is distinctly more slender than in the female. No frontal keel is found, but the 

 rostrum is longer and directed more downwards (text-fig. 32 b) ; the lateral corners are rounded, and the 

 fourth and fifth thoracic tergites are completely fused. The abdomen is distinctly one fourth as long 

 as the anterior division. The furcal rami are a little wider than long; the serrated seam along the 

 hinder margin of somites II — IV is fairly well developed. 



The antennulae extend to the end of the abdomen ; the appendages are scarcely different from 

 those of E. viessinensis; segments 8009 are completely fused with segment 10; segmerrts 12 and 13, 14 

 and 15 are more or less fused. The exopodite of the antennae is 1-4 as long as the endopodite, the 



